Electrolyte and lithium ion battery containing the electrolyte and/or positive electrode

Abstract

The invention provides an electrolyte, comprising a lithium salt, an electrolyte solvent and an additive, wherein the additive is a derivative of benzothiazole of the structure shown in the invention.The invention also provides a positive electrode and a lithium ion battery using the electrolyte. In the electrolyte provided by the invention, the derivative of benzothiazole of the structure provided by the invention is used as a specific additive of the invention, thereby improving the charge and discharge performance test and cycle of the lithium battery in a high voltage environment, extending the service life of the battery at a high voltage, and being applicable to the high voltage lithium ion battery electrolyte of the 5V system.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery containing the electrolyte and / or a positive electrode. Background technique [0002] Since the 1990s, lithium-ion secondary batteries have developed rapidly from their birth. Generally speaking, a lithium-ion battery with an electrolyte includes a casing, a cell contained in the casing, and an electrolyte. The cell includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. During charging, lithium ions migrate from the positive electrode through the electrolyte to the negative electrode, while they flow in the opposite direction during discharging. In recent years, secondary lithium-ion batteries with high energy density have become the object of people's attention. Therefore, people have also noticed some new active materials that can be used as secondary lithium b...

AI Technical Summary

Problems solved by technology

There are many studies on new electrolytes, most of which replace existing systems with new solvents, but there are disadvantages such as low conductivity or high viscosity

However, in the existing technology, there is a technical problem that the electrolyte solvent undergoes an oxidation reaction with the active points on the positive electrode at a high potential, and the solvent is further oxidized and decomposed, resulting in excessive consumption of the electrolyte solvent.

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